CVE-2026-31626

/* * Conceptual PoC for Uninitialized Variable Usage * This code demonstrates the vulnerability logic in rtw_BIP_verify(). */ #include <stdio.h> #include <string.h> // Vulnerable function simulation void vulnerable_function(unsigned char *input) { unsigned long long le_tmp64; // Uninitialized stack variable // Simulating the copy of 6 bytes into an 8-byte variable memcpy(&le_tmp64, input, 6); // The last 2 bytes of le_tmp64 contain random stack garbage printf("Value: 0x%llx\n", le_tmp64); // If the garbage bytes happen to match a specific value, // security checks could be bypassed. } int main() { unsigned char data[6] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06}; vulnerable_function(data); return 0; }

{"cve": {"id": "CVE-2026-31626", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-04-24T15:16:41.907", "lastModified": "2026-04-27T20:49:50.310", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: rtl8723bs: initialize le_tmp64 in rtw_BIP_verify()\n\nInitialize le_tmp64 to zero in rtw_BIP_verify() to prevent using\nuninitialized data.\n\nSmatch warns that only 6 bytes are copied to this 8-byte (u64)\nvariable, leaving the last two bytes uninitialized:\n\ndrivers/staging/rtl8723bs/core/rtw_security.c:1308 rtw_BIP_verify()\nwarn: not copying enough bytes for '&le_tmp64' (8 vs 6 bytes)\n\nInitializing the variable at the start of the function fixes this\nwarning and ensures predictable behavior."}], "metrics": {"cvssMetricV31": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 4.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-908"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.6.136", "matchCriteriaId": "022BB187-782F-49F9-A3AE-9DCC0B6012CE"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.83", "matchCriteriaId": "7F0AE5B5-23AC-4DCC-B37A-51CA1DAE7BA8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.24", "matchCriteriaId": "8126B8B8-6D0B-4443-86C1-672AEE893555"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.14", "matchCriteriaId": "D6A8A074-BBF4-4803-ABED-519A839435BB"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.0.1", "matchCriteriaId": "9B5888AB-7403-4335-89E4-21CC0B48366A"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8c964b82a4e97ec7f25e17b803ee196009b38a57", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/b487a7754d874230299d5a9c2710ec4df8b2ed8a", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/c2026c6b603ebec52f55015496703fe79077accf", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/c65ee4d3be5df395e48afbcd0946dd5fce4338a9", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/d5b8f5f8d6fc09a8af5ed139c688660f578ed732", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/ef74ce5f0bc0e53ce702d8a794f3957884a26efc", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}